Quota management allows you to manage common quotas and default quotas.
Manage common quotas—Use a common quota to monitor and limit the storage resource usage of a directory or user/user group and prevent excessive resource occupation from affecting service quality. A common quota is a default quota for a directory.
Manage default quotas—For a directory with a default quota, the system automatically creates a common quota to monitor and limit the resource usage of a user when the user performs a create, edit, delete, or write operation on the files in the directory. The common quota created based on the default quota is called a reference quota.